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OAKLAND, CA - FEBRUARY 17: The Port of Oakland sits behind the San Francisco-Oakland Bay Bridge on February 17, 2015 in Oakland, California. Dockworkers at 29 West Coast ports from Los Angeles to Seattle returned to work today after employers shut down operations over the long holiday weekend in response to an alleged work slow down amidst long contract negotiations between Pacific Maritime Association and the International Longshore and Warehouse Union. U.S. Secretary of Labor Thomas Perez traveled to San Francisco on Monday to help with the contract negotiations that have been dragging on for the past nine months. (Photo by Justin Sullivan/Getty Images)